linux-kernel - Re: [PATCH v2 1/5] jump_label: Provide CONFIG-driven build state defaults

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Date:   Tue, 24 Mar 2020 23:06:41 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Elena Reshetova <elena.reshetova@...el.com>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Potapenko <glider@...gle.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Jann Horn <jannh@...gle.com>,
        "Perla, Enrico" <enrico.perla@...el.com>,
        kernel-hardening@...ts.openwall.com,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] jump_label: Provide CONFIG-driven build state
 defaults

On Tue, Mar 24, 2020 at 01:32:27PM -0700, Kees Cook wrote:
> Choosing the initial state of static branches changes the assembly
> layout (if the condition is expected to be likely, inline, or unlikely,
> out of line via a jump). A few places in the kernel use (or could be
> using) a CONFIG to choose the default state, so provide the
> infrastructure to do this and convert the existing cases (init_on_alloc
> and init_on_free) to the new macros.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>

Cute,

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>